COSTA MESA, Calif. — For the second day in a row, Keenan Allen did not participate during the open portion of practice due to a troublesome hamstring. The Los Angeles Chargers listed the Pro Bowl wide receiver as questionable for Sunday's game against the Chicago Bears, the latest blow to an already injury battered roster.

After practicing in full Wednesday, Allen spent Thursday's practice on the exercise bike with the Chargers' other injured players. He remained there Friday with a sleeve around his left leg. After practice, Los Angeles head coach Anthony Lynn wouldn't rule out Allen due to the missed practices, but the wideout will need to prove he can run at full speed to play this week.

If Allen can't suit up Sunday, the Chargers will have to roll with Mike Williams, Geremy Davis, and Andre Patton as their main wide receivers against the Bears. Williams has led the group since returning from a back issue that kept him sidelined during a Week 4 tilt with the Miami Dolphins, catching 15 passes for 193 yards in the three games since. Tight end Hunter Henry will also factor into the passing game. Since recovering from a fractured knee, Henry has delivered a career-best 100-yard, two-touchdown outing against the Pittsburgh Steelers and a 97-yard follow-up performance against the Tennessee Titans.

Though Allen might miss Week 8, the Chargers will see Pro Bowl left tackle Russell Okung make his 2019 debut. Lynn said Okung would rotate with Trent Scott, the team's starter the previous seven weeks, this Sunday. Defensive end Melvin Ingram appears ready to return from a hamstring issue that cost him the previous three games.

-- Jason B. Hirschhorn is an award-winning sports journalist and Pro Football Writers of America member. Follow him on Twitter: @by_JBH